We all were there when Elon Musk was asking ‘The Flat Earth Society” the important questions, poking at the reasoning behind the theory that Earth is, in fact, a flat disc. While flat-earthers seem to lack substantial arguments in the debate and it seems quite obvious what the answer to the age-old question is, imgur user GregPagel’s views were challenged after he snapped a photo of Lake Michigan.

After examining the photos, Greg, a 47-year-old musician from Manitowoc, realized that the horizon he captured seemed quite flat, instantly raising doubts about everything he knew about Earth. “I’ve often looked at the horizon over that lake–thousands of times–and wondered “am I seeing a curve? I’m not sure. Maybe a little? Or is my mind playing tricks?” As a kid, I’d look at it a lot” Greg told Bored Panda. So, he did what any other person would do, he used science! “When I actually did the math and made the diagram, I actually felt a rush” Pagel recalled. Using Google Earth and some calculations he was able to figure it all out and share the surprising results with the world. Scroll down to see what he found out yourself!